Got an issue with it now. Going down the road and putting the clutch in to come to a stop, it'll stay around 1300 rpms. After getting off the highway, it'll rev low with the clutch in, and almost cut off. After getting on it and slowing down (clutch in) it cut off on me. I started it back up and the fuel like came on and read empty on the gauge (has half a tank) what could be the issue?

I had a similar issue with my Mach. Tried cleaning iac, didn't work. Replaced iac, nada. Turned out I had a lazy o2 sensor, which would jack up my fuel trims. When coming to a stop after spirited driving, slowing down to eventually stop, my fuel trims would go to total fuel cut off, like -20, and not bounce back up like they should and the car would stall out. It would start back up just fine. Replaced the 2 upstream o2 sensors...no more issues

I had a similar issue with my Mach. Tried cleaning iac, didn't work. Replaced iac, nada. Turned out I had a lazy o2 sensor, which would jack up my fuel trims. When coming to a stop after spirited driving, slowing down to eventually stop, my fuel trims would go to total fuel cut off, like -20, and not bounce back up like they should and the car would stall out. It would start back up just fine. Replaced the 2 upstream o2 sensors...no more issues

Electrical gremlins are always the worst, I hate them. He should try the IAC for sure and then do the upstream O2s. Densos from Rockauto are just fine for replacement O2 sensors vs paying out your anus for the Ford ones or even another brand from a local box store.